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| author |   Rui Miguel Silva <rmfrfs@gmail.com> | 2017-05-12 21:16:15 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-16 14:23:31 +0200 |
| commit | 50b7c322cfc8b44a36b1373dab2177db23e3282c (patch) | |
| tree | cca951e511cf8d6c1f229c0a938adb390a738c19 /drivers/staging | |
| parent | staging: typec: fusb302: reset i2c_busy state in error (diff) | |
| download | linux-dev-50b7c322cfc8b44a36b1373dab2177db23e3282c.tar.xz linux-dev-50b7c322cfc8b44a36b1373dab2177db23e3282c.zip | |
staging: typec: fusb302: refactor resume retry mechanism
The i2c functions need to test the pm_suspend state and do, if needed, some
retry before i2c operations. This code was repeated 4x.
To isolate this, create a new function to check suspend state and call it in
every need place.
As at it, move the error message from pr_err to dev_err.
Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
Acked-by: Yueyao Zhu <yueyao.zhu@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/typec/fusb302/fusb302.c | 70 |
1 files changed, 36 insertions, 34 deletions
diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c index 7b0b9e51016d..4a356e509fe4 100644 --- a/drivers/staging/typec/fusb302/fusb302.c +++ b/drivers/staging/typec/fusb302/fusb302.c @@ -264,22 +264,36 @@ static void fusb302_debugfs_exit(const struct fusb302_chip *chip) { } #define FUSB302_RESUME_RETRY 10 #define FUSB302_RESUME_RETRY_SLEEP 50 -static int fusb302_i2c_write(struct fusb302_chip *chip, - u8 address, u8 data) + +static bool fusb302_is_suspended(struct fusb302_chip *chip) { int retry_cnt; - int ret = 0; - atomic_set(&chip->i2c_busy, 1); for (retry_cnt = 0; retry_cnt < FUSB302_RESUME_RETRY; retry_cnt++) { if (atomic_read(&chip->pm_suspend)) { - pr_err("fusb302_i2c: pm suspend, retry %d/%d\n", - retry_cnt + 1, FUSB302_RESUME_RETRY); + dev_err(chip->dev, "i2c: pm suspend, retry %d/%d\n", + retry_cnt + 1, FUSB302_RESUME_RETRY); msleep(FUSB302_RESUME_RETRY_SLEEP); } else { - break; + return false; } } + + return true; +} + +static int fusb302_i2c_write(struct fusb302_chip *chip, + u8 address, u8 data) +{ + int ret = 0; + + atomic_set(&chip->i2c_busy, 1); + + if (fusb302_is_suspended(chip)) { + atomic_set(&chip->i2c_busy, 0); + return -ETIMEDOUT; + } + ret = i2c_smbus_write_byte_data(chip->i2c_client, address, data); if (ret < 0) fusb302_log(chip, "cannot write 0x%02x to 0x%02x, ret=%d", @@ -292,21 +306,17 @@ static int fusb302_i2c_write(struct fusb302_chip *chip, static int fusb302_i2c_block_write(struct fusb302_chip *chip, u8 address, u8 length, const u8 *data) { - int retry_cnt; int ret = 0; if (length <= 0) return ret; atomic_set(&chip->i2c_busy, 1); - for (retry_cnt = 0; retry_cnt < FUSB302_RESUME_RETRY; retry_cnt++) { - if (atomic_read(&chip->pm_suspend)) { - pr_err("fusb302_i2c: pm suspend, retry %d/%d\n", - retry_cnt + 1, FUSB302_RESUME_RETRY); - msleep(FUSB302_RESUME_RETRY_SLEEP); - } else { - break; - } + + if (fusb302_is_suspended(chip)) { + atomic_set(&chip->i2c_busy, 0); + return -ETIMEDOUT; } + ret = i2c_smbus_write_i2c_block_data(chip->i2c_client, address, length, data); if (ret < 0) @@ -320,19 +330,15 @@ static int fusb302_i2c_block_write(struct fusb302_chip *chip, u8 address, static int fusb302_i2c_read(struct fusb302_chip *chip, u8 address, u8 *data) { - int retry_cnt; int ret = 0; atomic_set(&chip->i2c_busy, 1); - for (retry_cnt = 0; retry_cnt < FUSB302_RESUME_RETRY; retry_cnt++) { - if (atomic_read(&chip->pm_suspend)) { - pr_err("fusb302_i2c: pm suspend, retry %d/%d\n", - retry_cnt + 1, FUSB302_RESUME_RETRY); - msleep(FUSB302_RESUME_RETRY_SLEEP); - } else { - break; - } + + if (fusb302_is_suspended(chip)) { + atomic_set(&chip->i2c_busy, 0); + return -ETIMEDOUT; } + ret = i2c_smbus_read_byte_data(chip->i2c_client, address); *data = (u8)ret; if (ret < 0) @@ -345,21 +351,17 @@ static int fusb302_i2c_read(struct fusb302_chip *chip, static int fusb302_i2c_block_read(struct fusb302_chip *chip, u8 address, u8 length, u8 *data) { - int retry_cnt; int ret = 0; if (length <= 0) return ret; atomic_set(&chip->i2c_busy, 1); - for (retry_cnt = 0; retry_cnt < FUSB302_RESUME_RETRY; retry_cnt++) { - if (atomic_read(&chip->pm_suspend)) { - pr_err("fusb302_i2c: pm suspend, retry %d/%d\n", - retry_cnt + 1, FUSB302_RESUME_RETRY); - msleep(FUSB302_RESUME_RETRY_SLEEP); - } else { - break; - } + + if (fusb302_is_suspended(chip)) { + atomic_set(&chip->i2c_busy, 0); + return -ETIMEDOUT; } + ret = i2c_smbus_read_i2c_block_data(chip->i2c_client, address, length, data); if (ret < 0) { |